search query: @keyword virtual world / total: 4
references: 1-4 / 4
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| title | year | author | ||
| 1. | 2015 | Paasonen, Juhani |
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| 2. | 2014 | Palomäki, Sonja |
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| 3. | 2013 | Virtanen, Hanna |
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| 4. | 2013 | Brusin, Jaana |
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